Hot spot manifold



Aug. 11, 1931. H. B. PETlT HOT SPOT MANIFOLD Original Filed May 27, 1927 2 Sheets-Sheet 1 ATTORNEY Original Filed May 27, 1927 2 Sheets-Sheei 2 INVENTOR H RY fl, Afr/ ATTORNEY Patented Aug. 11, 1931 UNITED STATES.-

rA'r-eur OFFICE HENRY B. rn'n'r, or DETROIT, mrcnioamnssienon 'ro enonen m. noLLEY, or

' DETROIT, MICHIGAN nor sro'r MANIFOLD Application filed May 27, 1927, Serial No. 194,667. Renewed May 22, 1930.

This invention relates to a hot spot manifold adapted to be used with an internal combustion engine having external vaporizlng means.

The specific object of this invention is to combine in one manifold an adjustable hot spotwith a fuel vaporizing device, the effectiveness of whichis not varied.

Fi ure 1 shows an elevation, with the float E cham er removed.

Figure 2 shows a partial section on plane 2-2 of Figure 1.

Figure 3 shows a section on the lane 3-3 of Figure 1, said plane being inchned .from the normal in order better to illustrate the invention.

In the figures, A is the exhaust manifold, having four exhaust entrances located at O O O, O. B is the inlet manifold. C is the hot spot provided in the inlet manifold at the point where the incoming mixture divides,

into twp horizontal streams and also where the exhaust gases from all the cylinders are united in one stream by the partition L. In Figure 3 the exhaust entrance corresponds to both 0 and O, which discharge on either side of the throttle D. D is a valve in the exhaust manifold controlled by a lever E, which in one position directs this united stream of exhaust gases against the hot spot C, and in another position, shown in broken lines in Figure 3, diverts the stream of exhaust gases away from the hot spot 0.

Z is a fuel va orizing means consisting of a hollow cover or an opening in the exhaust manifold A, corresponding to the vaporizing elements 44 in the Welch Patent #1547474,

' or to the elements 31, 32, 33 of the Welch Patent #1562670. The fuel is fed to this vaporiz- 'ing element Z from the float chamber F, and

a small quantity of air is admitted through the'passage G from the main air entrance N which communicates with G through the pipe P. The purpose of admitting this primary air is to entrain the fuel and facilitate vaporization. In Figure 1 the float chamber F is removed so that the fuel entrance G can be seen.- The details of the float and'nozzle construction are not shown.

H is the outlet from the vaporizing element located in the cover Z. The vapor flows through the passage I to the throat of. the

-Venturi tube J which forms the mixing chamber and which is supplied with air from the air entrance N which communicates with the atmosphere, where the vaporized fuel is diluted with the cold air, the mixture thus formed flows through the mixture outlet past the throttle K into the inlet manifold B. The exhaust gases united in one stream are passed through a passage controlled by a valve D (lever E) and delivered over the vaporizing element located in the cover E. The exhaust gases finally discharge through the exhaust outlet M.

0pemti0n.The exhaust enters the manifold from O O O, O, and is united by the partition L into one stream, which, by means of the valve D (in the position illustrated), is diverted against the hot spot G,'whence it flows down to M, sweeping enroute over the fuel vaporizing device located within the cover E. When the valve D is in the horizontal position, shown in broken lines in Figure 3, the exhaust enterin at 0 0 ,0", 0, flows directly againstthe uel vaporizing device E, and so to the exhaust outlet M, avoiding the hot spot 0. It is obvious therefore, that the exhaust gases flow at all times over the fuel va orizing device E, but on the other hand, the ot spot C is only operative when the exhaust valve D is in the vertical osition. 7 Very effective means for contro g the mixture temperature in B is thus provided, which is the object of this invention.

In cold weather when the maximum heat' is desired, any fuel which flows through E H I to the mixing chamber J and past the throttle valve K and is not thereupon vaporized is deposited upon the hot spot C, where it v that the wetter the mixture the larger the effective area of the hot spot G, and the dryer the mixture the less effective is this hot spot, which is one reason this hot spot gives the 5 results it does.

' When the valve 1) is in the horizontal position, the exhaust space between D and forms an ante-chamber which serves as a heat insulator preventing heat passing to C from O. The operator is thus able to control the mixture temperature, or rather to compensate for variations in atmospheric temperature, as the desired result is that the mixture temperature should be kept between certain permissible limits, namely between 160 F. and 200 F. when operating with kerosene, and between 110 F. and 140 F. when operating with gasoline.

What I claim is 1. A vaporizer, comprising an exhaust manifold, an outlet therefrom, an opening therein adjacent said outlet, a cover therefor, a vaporizing element located in said cover, means for admitting fuel to said element, an inlet manifold located above said exhaust manifold, a mixin chamber discharging into said inlet manifol a passage connecting said vaporizing element with said mixing cham}- ber, a wall common to said inlet and exhaust manifolds, a partition in said exhaust mani-v fold adapted to unite all the exhaust gas into one stream, a valve in said exhaust manifold, said valve being located so as to cooperate with said partition so as to direct all the exhaust gases against the said hot spot when in one position, and, in another position, to divert all the exhaust gases away from said hot spot, but in neither osition to interfere with the free flow of t e exhaust gases over said vaporizing element.

2. A vaporizer comprising an inlet manifold, an exhaust manifold, an outlet therefrom, a partition in said exhaust manifold serving to concentrate all the exhaust gases in the exhaust manifold at a point intermedie ate between the entrance and the exit, a

heated wall in said inlet manifold forming also the wall of the exhaust manifold, located where the exhaust gases are concentrated into one stream, a mixture chamber discharging an ex losive mixture to said inlet manifold direct y against said hot spot.

3. A vaporizer comprising an inlet manifold, an exhaust manifold having an outlet,

haust manifold located one position to shunt the exhaust gases in the exhaust manifold at an intermediate point in said exhaust manifold, and in another position to isolate the hot spot from the stream of exhaust gases, a heated wall in said inlet manifold forming also the wall in the exwhere the shunted exhaust gases will impinge thereon I and thereover, a mixture chamber discharging an explosive mixture directly against said hot s 0t.

5. A vaporizer, comprising an inlet manifold an exhaust manifold, an outlet therefrom, a moveable partition in said exhaust manifold serving to concentrate the exhaust gases in the exhaust manifold at a oint intermediate between the entrance an the exit to any desired degree, a heated wall in said inlet manifold forming also the wall of the exhaust manifold, located where the exhaust gases are so concentrated so as to impinge on said hot wall in said inlet manifold, a mix ture chamber discharging an explosive mixture to said inlet manifold directly against said hot spot.

6. An inlet manifold, an exhaust manifold, a common wall there between, a moveable partition in said exhaust manifold, so located that in one position said exhaust gases are thrown against said common wall, and in another the common wall is isolated from the exhaust gases by means of a complete stoppage of the exhaust gases.

In testimony whereof I aflix my signature.

HENRY B. PETIT.

a moveable partition in said exhaust manifold 5 at an intermediate point in said exhaust manifold, a heated wall in said inlet manifold forming also the wall in the exhaust manifold so located that the shunted exhaust gases are directed thereon and thereover, a mixture chamber discharging an explosive mixture directly against said hot spot.

4. A vaporizer comprising an inlet manifold, an exhaust manifold having an outlet, a moveable partition in said exhaust serving in 

